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Posted

Nice collection.  I have never seen this type before.  
 

IMG_4146.jpeg

  • Like 3
Posted

@Ed-H, and others, any help on ID,ing this would be appreciated. Thanks! 

 

IMG_20230709_152906162.jpg

 

1688941904270454418748434691781.jpg

 

16889419350031227517171887873265.jpg

  • Like 3
Posted

I have seen, and used, this irwin expansion bit, looks like they are cousins, but yours looks a little more refined.  
 

IMG_4152.jpeg

Posted

I have a couple expansion bits and like Ed said yours looks a bit more sophisticated/ or someone idea to fancy up a bit. However that extra spur seems to defeat having a flat bottom.

  • Like 3
Posted

The worm on the end kinda ruins the flat bottom concept too.   I didn’t realize they were intended to make flat bottom holes.  

  • Like 2

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